Astros shortstop Gregorio Petit, right, who joined the team after being called up from Oklahoma City, earns a fist bump from third-base coach Pat Listach after getting a single in the third inning Friday night.

Astros shortstop Gregorio Petit, right, who joined the team after...

After mentoring KikéHernandez and several young prospects at Class AAA Oklahoma City all season, infielder Gregorio Petit was rewarded with a call-up to the majors, joining the Astros on Friday to provide cover while Marwin Gonzalez nurses a tender right hamstring.

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